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> Foster Seeley Discriminator
mikko
Posted: August 21, 2008 06:27 pm
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How foster seeley discriminator works? Google and books wont tell.


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danga1993
Posted: August 21, 2008 07:51 pm
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mikko
Posted: August 22, 2008 08:01 am
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First link didnt tell anything and i didnt understand second link. Question is how it works not what it does.


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MacFromOK
Posted: August 22, 2008 09:12 am
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"It uses a tuned RF transformer to convert frequency changes into amplitude changes."

More info on "how it works" here:
http://en.wikipedia.org/wiki/Foster-Seeley_discriminator


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mikko
Posted: August 22, 2008 09:26 am
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QUOTE (MacFromOK @ August 22, 2008 09:12 am)
"It uses a tuned RF transformer to convert frequency changes into amplitude changes."

More info on "how it works" here:
http://en.wikipedia.org/wiki/Foster-Seeley_discriminator

That doesnt tell how it works.


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MacFromOK
Posted: August 22, 2008 09:31 am
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"A transformer, tuned to the carrier frequency, is connected to two rectifier diodes. The circuit resembles a full-wave bridge rectifier. If the input equals the carrier frequency, the two halves of the tuned transformer circuit produce the same rectified voltage and the output is zero. As the frequency of the carrier changes, the balance between the two halves of the transformer secondary changes, and the result is a voltage proportional to the frequency deviation of the carrier."

Seems like a fairly decent explanation to me. Is there something specific you want to know? blink.gif


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mikko
Posted: August 22, 2008 11:58 am
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QUOTE (MacFromOK @ August 22, 2008 09:31 am)
"A transformer, tuned to the carrier frequency, is connected to two rectifier diodes. The circuit resembles a full-wave bridge rectifier. If the input equals the carrier frequency, the two halves of the tuned transformer circuit produce the same rectified voltage and the output is zero. As the frequency of the carrier changes, the balance between the two halves of the transformer secondary changes, and the result is a voltage proportional to the frequency deviation of the carrier."

Seems like a fairly decent explanation to me. Is there something specific you want to know? blink.gif

That doesnt tell what affects to balance between two halves of the transformer secondary. It also doesnt tell meanings for all components of foster seeley discriminator.


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CWB
Posted: August 22, 2008 02:52 pm
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hmmm ...

you might want to read about bandwidth of tuned transformers ("Q") , quadrature detection and phase balance .

understanding how foster seely , ratio and quadrature detection/demodulation/discrimination works is kind of hard ... you need to know the basics and then put it together in your head .

amplitude modulation is pretty easy to understand/see in your head .
frequency modulation is much harder .


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mikko
Posted: September 10, 2008 12:31 pm
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QUOTE (CWB @ August 22, 2008 02:52 pm)
hmmm ...

you might want to read about bandwidth of tuned transformers ("Q") , quadrature detection and phase balance .

understanding how foster seely , ratio and quadrature detection/demodulation/discrimination works is kind of hard ... you need to know the basics and then put it together in your head .

amplitude modulation is pretty easy to understand/see in your head .
frequency modulation is much harder .

I know how ratio detector works.


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dselec
Posted: March 12, 2010 11:11 pm
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Hello
this link will explain completely
http://www.tpub.com/neets/book12/51c.htm
good luck
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